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>Fractional Factorial Design Study on the Performance of GAC-Enhanced Electrocoagulation Process Involved in Color Removal from Dye Solutions
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Fractional Factorial Design Study on the Performance of GAC-Enhanced Electrocoagulation Process Involved in Color Removal from Dye Solutions
The aim of this study was to determine the effects of main factors and interactions on the color removal performance from dye solutions using the electrocoagulation process enhanced by adsorption on Granular Activated Carbon (GAC). In this study, a mathematical approach was conducted using a two-level fractional factorial design (FFD) for a given dye solution. Three textile dyes: Acid Blue 74, Basic Red 1, and Reactive Black 5 were used. Experimental factors used and their respective levels were: current density (2.73 or 27.32 A/m2), initial pH of aqueous dye solution (3 or 9), electrocoagulation time (20 or 180 min), GAC dose (0.1 or 0.5 g/L), support electrolyte (2 or 50 mM), initial dye concentration (0.05 or 0.25 g/L) and current type (Direct Current—DC or Alternative Pulsed Current—APC). GAC-enhanced electrocoagulation performance was analyzed statistically in terms of removal efficiency, electrical energy, and electrode material consumptions, using modeling polynomial equations. The statistical significance of GAC dose level on the performance of GAC enhanced electrocoagulation and the experimental conditions that favor the process operation of electrocoagulation in APC regime were determined. The local optimal experimental conditions were established using a multi-objective desirability function method.
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机译:这项研究的目的是确定主要因素和相互作用对染料溶液脱色性能的影响,该过程使用了通过吸附在颗粒活性炭(GAC)上增强的电凝过程。在这项研究中,针对给定的染料溶液,使用两级分数阶乘设计(FFD)进行了数学计算。使用了三种纺织染料:酸性蓝74,碱性红1和活性黑5。使用的实验因素及其各自的水平是:电流密度(2.73或27.32 A / m 2 sup>),染料水溶液的初始pH值(3或9),电凝时间(20或180分钟),GAC剂量(0.1或0.5 g / L),支持电解质(2或50 mM),初始染料浓度(0.05或0.25 g / L)和电流类型(直流电-DC或交流电-APC)。使用建模多项式方程,从去除效率,电能和电极材料消耗方面对GAC增强的电凝性能进行了统计分析。确定了GAC剂量水平对GAC增强电凝性能的统计意义,并确定了有利于APC方案中电凝过程操作的实验条件。使用多目标期望函数法建立了局部最佳实验条件。
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